A communications network access method that uses a continuously repeating frame (the token) that is transmitted onto the network by the controlling computer. When a terminal or computer wants to send a message, it waits for an empty token. When it finds one, it fills it with the address of the destination station and some or all of its message.
Every node on the network constantly monitors the passing tokens to determine if it is a recipient of a message, in which case it "grabs" the message and resets the token status to empty. Token passing uses bus and ring topologies. See token bus network
and token ring network